Substituted pyrimidines
a technology of substituted pyrimidines and pyrimidines, which is applied in the field of substituted pyrimidines, can solve the problems of general reduction of quality of life, fatigue, dizziness, and fatigue, and achieves the effects of reducing the quality of li
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example 1
[0345]
Step A: (4-bromophenyl)(4-methoxyphenyl)methanone (1-1-b)
[0346]To a cooled (0° C.) mixture of 4-bromobenzoyl chloride, 1-1-a, (25 g, 0.114 mol) and anisole (15.5 g, 0.143 mol) in DCM (500 ml) was added AlCl3 (19 g, 0.143 mol) portion wise with stirring under N2. The resulting reaction mixture was allowed to stir at r.t for 16 h. The reaction mixture was poured into 20% HCl (500 ml) and the solution stirred for 1 h. After stirring, the resulting solution was allowed to separate into phase layers. The aqueous layer was collected and further extracted with DCM (3×250 ml). The combined organic layer was washed with water (200 ml), brine (200 ml), dried (Na2SO24), filtered and concentrated under reduced pressure to yield 30 g of a white solid, 1-1-b. 1H NMR (300 MHZ, CDCl3): 3.91 (s, 3H), 6.99 (d, 2H), 7.65 (s, 4H), 7.82 (d, 2H).
Step B: (4-bromophenyl)(4-methoxyphenyl)methanamine (1-1-c)
[0347](4-bromophenyl)(4-methoxyphenyl)methanone, 1-1-b, (3.0 g, 0.01 mol) was heated with formam...
example 2
[0365]
Step A: (4-bromophenyl)(phenyl)methanamine (2-b)
[0366](4-bromophenyl)(phenyl)methanone (200 g, 0.77 mol) was heated with formamide (600 ml) for 24 hours at 185° C., and the mixture was cooled to room temperature before poured into water. The product was filtered off and washed with water. It was recrystallized in EtOH / H2O to provide an intermediate (120 g, 54%). The above intermediate (100 g, 0.35 mol) was heated at reflux with potassium hydroxide (150 g, 2.6 mol.) in methanol (800 ml) for 8 hours. The mixture was concentrated under vacuum and the residue was diluted with water followed by extraction of ethyl acetate. The organic layer was dried over sodium sulfate and concentrated to provide the product, 2-b, (70 g, 78%). 1H NMR (CDCl3, 300 MHz,): δ 7.30 (m, 9H), 5.18 (s, 1H), 1.82 (s, 2H).
Step B: diethyl 4-(amino(phenyl)methyl)phenylphosphonate (2-c)
[0367](4-bromophenyl)(phenyl)methanamine, 2-b, (41.9 g, 0.16 mmol) in DCM was added TEA (38.78 g, 0.38 mmol) and the mixture wa...
example 3
[0382]
Step A: tert-butyl 1-(4-bromophenyl)ethanamine (3-b)
[0383]1-(4-bromophenyl)ethanamine 3-a (5 g, 25 mmol) in DCM (100 ml) was added TEA (5.07 g, 50 mmol) and the mixture was cooled to 0° C. Boc2O (8.13 g, 37 mmol) was added at this temperature. Then the resulting mixture was stirred at room temperature overnight. The mixture was concentrated under vacuum and the residue was washed with hexane to provide 3-b (6.17 g, 82%). (M+H)+=300, 302.
Step B: Diethyl (4-{1-[(tert-butoxycarbonyl)amino]ethyl}phosphonate (3-c)
[0384]To tert-butyl 1-(4-bromophenyl)ethylcarbamate (3-b, 2 g, 6.7 mmol), diethyl phosphite (2.77 g, 20 mmol) and Et3N (2.03 g, 20 mmol) in toluene (30 ml) was added Pd(PPh3)4 (2.32 g). The mixture was allowed to stir overnight at 100° C. The mixture was filtered and the filtrate was concentrated under vacuum. The residue was purified over silica gel (petroleum ether / ethyl acetate=20 / 1) to provide the product 3-c (1.3 g, 56%). (M+H)+=358.
Step C: Diethyl[4-(1-amino)ethyl)ph...
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